IT 420 Spring 2019 Homework 1

IT 420

Spring 2019

Homework 1

            Note:  Where applicable, units of the solution must be correct for full credit.

  1. Answer the following questions concerning chapter 1:
  • As an arriving message moves from the network interface layer up to the application layer, headers are ______ .
  1. added b. removed c. rearranged   d. modified

   1.2  Which are peer layers?

  1. The application layer in the sender and the transport layer in the sender
  2. The application layer in the receiver and the transport layer in the receiver
  3. The application layer in the sender and the transport layer in the receiver
  4. The application layer in the sender and the application layer in the receiver

1.3  If the unit exchanged at the network interface layer (layer 2) is called a frame and the unit exchanged at the internet layer (layer 3) is called a packet,

  1. frames encapsulate packets b.  packets encapsulate frames
  2. both a and b d.  neither a nor b
  1. Choose which layer each of the following phrases describes:
  1. Application b.  Transport    c.  Internet       d.  Network Interface  e.  Physical

__B____  Process to process communication


__E____  Media              

__A____ Interacts with the user  

__E_____ Encodes data using physical phenomena, such as changing voltage 

__C____  Host to host communication

__D_____Sends a frame through a single local area network

__D____  Uses physical (MAC) addresses          in the header


__C____  Uses IP addresses in the header          

__B____  Uses protocol ports in the header

  1. Assume a five layer TCP/IP model. There are A bytes of application data. A B byte header is added at the transport layer, a C byte header is added at the internet layer and a D byte header is added at the network interface layer.  The network interface layer also adds an E byte trailer. Express the answers to the questions below in terms of A, B, C, D, and E.
  1. How many total bytes are sent to the physical layer? A + B + C + D + E
  2. What percentage of the bytes sent to the physical layer is overhead?

((B + C + D + E) / (A + B + C + D + E)) * 100 %

  1. How many total bytes are in the transport layer packet? A + B
  2. What percentage of the bytes in the transport layer packet is overhead?

(B / (A + B)) * 100 %

  1. In the five-layer networking model, data sent to the physical layer consists of the application data, network interface layer header, network interface layer trailer, internet layer header, and transport layer header. In the diagram of data sent to the physical layer below, label each part using one of the terms above. (Order matters.)


  1. Answer the following questions concerning chapter 6:

5.1   A signal has 100 possible levels.  This signal is

  1. analog digital         c.  neither        d.  cannot be determined

   5.2  As the period of a sine wave increases, the frequency __________________ .

  1. decreases         b.  increases     c. remains the same     d. doubles

   5.3  A possible unit for analog bandwidth is bits per second.

  1. true                         b.  false

   5.4  A simple sine wave is created by adding multiple composite signals together.

  1. true             b.  false
  1. Match the terms concerning sine waves with their definitions
  1. Period   frequency               c.  amplitude               d.  analog bandwidth

__D____  The difference  between the high frequency and the low frequency

__B____  The number of cycles per second

__C____  The absolute value of the peak value

__A_____ The time for one cycle

  1. Write the equation for a sine wave with an amplitude of 3, a frequency of 5, and a phase of π/2. f(t) = 3sin(2π5t + π/2)
  1. Draw the following sine wave in the time domain, showing amplitude and phase:

 s(t) = 4sin (2πt + π)

  1. What is the phase of each sine wave shown below?

3/2 π; 0 or 2π; π

  1. What is the period of a 5 MHz sine wave?

 = 0.2 microseconds

  1. A sine wave has a period of 4 msec. What is the frequency?

 = 250 Hz = 0.25 KHz (is the unit for this answer supposed to be in Hz or KHz?)

  1. Consider the following composite signal.

f(t) = 2sin(2π5t) + 3sin(2π7t) + 4sin(2π9t)

  1. Graph this in the frequency domain, showing amplitude and frequency
  2. Assuming the frequency is in Hertz, what is the analog bandwidth for this signal?

Analog bandwidth = fhigh – flow = 9 Hz – 5 Hz = 4 Hz



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